Which number is divisible by 3 and 5
a. 130
b. 325
c. 4113
d. 2040

A number that is divisible by 5 is one that ends with either a 5 or 0.  To find a number that is divisible by 3 add up the digits and if they are divisible by 3, the number also is.  That rules c out because it doesn't end with a 5 or 0.  130 and 325 won't work because they are not divisible by 3.  The answer would be 2040.

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